48 lines
2.0 KiB
C++
48 lines
2.0 KiB
C++
// Copyright (c) 2009-2016 Vladimir Batov.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
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#ifndef BOOST_CONVERT_IS_CONVERTER_HPP
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#define BOOST_CONVERT_IS_CONVERTER_HPP
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#include <boost/convert/detail/forward.hpp>
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#include <boost/convert/detail/is_callable.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits.hpp>
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#include <boost/ref.hpp>
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namespace boost { namespace cnv
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{
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template<typename, typename, typename, typename =void>
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struct is_cnv { BOOST_STATIC_CONSTANT(bool, value = false); };
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template<typename Class, typename TypeIn, typename TypeOut>
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struct is_cnv<Class, TypeIn, TypeOut, typename enable_if<is_class<Class>, void>::type>
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{
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typedef typename ::boost::unwrap_reference<Class>::type class_type;
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typedef void signature_type(TypeIn const&, optional<TypeOut>&);
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BOOST_DECLARE_IS_CALLABLE(is_callable, operator());
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BOOST_STATIC_CONSTANT(bool, value = (is_callable<class_type, signature_type>::value));
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};
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template<typename Function, typename TypeIn, typename TypeOut>
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struct is_cnv<Function, TypeIn, TypeOut,
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typename enable_if_c<is_function<Function>::value && function_types::function_arity<Function>::value == 2,
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void>::type>
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{
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typedef TypeIn in_type;
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typedef optional<TypeOut>& out_type;
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typedef typename function_traits<Function>::arg1_type func_in_type;
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typedef typename function_traits<Function>::arg2_type func_out_type;
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BOOST_STATIC_CONSTANT(bool, in_good = (is_convertible<in_type, func_in_type>::value));
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BOOST_STATIC_CONSTANT(bool, out_good = (is_same<out_type, func_out_type>::value));
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BOOST_STATIC_CONSTANT(bool, value = (in_good && out_good));
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};
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}}
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#endif // BOOST_CONVERT_IS_CONVERTER_HPP
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